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How can I check if a command exists in a shell script? [duplicate]
I am writing my first shell script. In my script I would like to check if a certain command exists, and if not, install the executable. How would I check if this command exists?
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Redirect stderr and stdout in Bash
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According to wiki.bash-hackers.org/scripting/obsolete, it seems to be obsolete in the sense that it is not part of POSIX, but the bash man page makes no mention of it being removed from bash in the near future. The man page does specify a preference for '&...
Open new Terminal Tab from command line (Mac OS X)
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Try this:
osascript -e 'tell application "Terminal" to activate' -e 'tell application "System Events" to tell process "Terminal" to keystroke "t" using command down'
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Application Error - The connection to the server was unsuccessful. (file:///android_asset/www/index.
...d you made some UI modifications, may be the size of images are high)
Your script may have a infinite or long loop, so that it takes too much of time to load.
You will be using too much of scripts (jQuery, iscroll, etc etc.. more number of plugins or scripts )
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Accurate way to measure execution times of php scripts
... This answer is out of date. Nowadays the best way to report script execution time is a single line at the end of your code: $time = microtime(true) - $_SERVER["REQUEST_TIME_FLOAT"]; (More info in an answer below.)
– ashleedawg
Apr 2 '19 at 20:56...
TypeScript: casting HTMLElement
Does anyone know how to cast in TypeScript?
13 Answers
13
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Version vs build in Xcode
...y increase the number by one, increasing forever. In my projects, I have a script that automatically increases the build number every time I build. See instructions for that below.
Release 1.0.0 might be build 542. It took 542 builds to get to a
1.0.0 release.
Release 1.0.1 might be build 578.
Rel...
Why does Google prepend while(1); to their JSON responses?
...ity issue that is formally fixed in all major browsers since 2011 with ECMAScript 5.
Contrived example: say Google has a URL like mail.google.com/json?action=inbox which returns the first 50 messages of your inbox in JSON format. Evil websites on other domains can't make AJAX requests to get this d...
Bash script to cd to directory with spaces in pathname
I'm using Bash on macOS X and I'd like to create a simple executable script file that would change to another directory when it's run. However, the path to that directory has spaces in it. How the heck do you do this? This is what I have...
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Are there other whitespace codes like   for half-spaces, em-spaces, en-spaces etc useful in HTML
... from being joined into a ligature, which is sometimes useful in non-Latin scripts.
– duskwuff -inactive-
Aug 11 '18 at 21:24
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